springboot mail通过465端口发送邮件报错的解决

系统最近从测试环境部署到正式环境，之前在springboot配置的java mail配置工作都是正常的，但是迁移到了生产环境不工作了。因为之前没有在配置端口，默认是25。生产环境用的是465端口，用到了ssl认证。控制台报错信息如下:

org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Could not convert socket to TLS;
  nested exception is:
        javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target. Failed messages: javax.mail.MessagingException: Could not convert socket to TLS;
  nested exception is:
        javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
        at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:432)
        at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:307)
        at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:296)

经查询，原因应该是没有通过邮件服务器认证造成的，还需要在配置文件中加上spring.mail.properties.mail.smtp.ssl.trust的配置

最后，附上springboot mail相关的配置:

#Email service
spring.mail.host=smtp.xxx.com
spring.mail[email protected]
spring.mail.password=xxxxxx
spring.mail.default-encoding=UTF-8
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.starttls.required=true
spring.mail.properties.mail.smtp.socketFactory.port=465
spring.mail.properties.mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory
spring.mail.properties.mail.smtp.ssl.trust=smtp.xxx.com
spring.mail.properties.mail.smtp.connectiontimeout=30000
spring.mail.properties.mail.smtp.timeout=20000
spring.mail.properties.mail.smtp.writetimeout=10000